drivers/infiniband/core/verbs.c

   1 /*
   2  * Copyright (c) 2004 Mellanox Technologies Ltd.  All rights reserved.
   3  * Copyright (c) 2004 Infinicon Corporation.  All rights reserved.
   4  * Copyright (c) 2004 Intel Corporation.  All rights reserved.
   5  * Copyright (c) 2004 Topspin Corporation.  All rights reserved.
   6  * Copyright (c) 2004 Voltaire Corporation.  All rights reserved.
   7  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
   8  * Copyright (c) 2005 Cisco Systems.  All rights reserved.
   9  *
  10  * This software is available to you under a choice of one of two
  11  * licenses.  You may choose to be licensed under the terms of the GNU
  12  * General Public License (GPL) Version 2, available from the file
  13  * COPYING in the main directory of this source tree, or the
  14  * OpenIB.org BSD license below:
  15  *
  16  *     Redistribution and use in source and binary forms, with or
  17  *     without modification, are permitted provided that the following
  18  *     conditions are met:
  19  *
  20  *      - Redistributions of source code must retain the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer.
  23  *
  24  *      - Redistributions in binary form must reproduce the above
  25  *        copyright notice, this list of conditions and the following
  26  *        disclaimer in the documentation and/or other materials
  27  *        provided with the distribution.
  28  *
  29  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  30  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  31  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  32  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  33  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  34  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  35  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  36  * SOFTWARE.
  37  *
  38  * $Id: verbs.c 1349 2004-12-16 21:09:43Z roland $
  39  */
  40
  41 #include <linux/errno.h>
  42 #include <linux/err.h>
  43
  44 #include <rdma/ib_verbs.h>
  45 #include <rdma/ib_cache.h>
  46
  47 /* Protection domains */
  48
  49 struct ib_pd *ib_alloc_pd(struct ib_device *device)
  50 {
  51         struct ib_pd *pd;
  52
  53         pd = device->alloc_pd(device, NULL, NULL);
  54
  55         if (!IS_ERR(pd)) {
  56                 pd->device  = device;
  57                 pd->uobject = NULL;
  58                 atomic_set(&pd->usecnt, 0);
  59         }
  60
  61         return pd;
  62 }
  63 EXPORT_SYMBOL(ib_alloc_pd);
  64
  65 int ib_dealloc_pd(struct ib_pd *pd)
  66 {
  67         if (atomic_read(&pd->usecnt))
  68                 return -EBUSY;
  69
  70         return pd->device->dealloc_pd(pd);
  71 }
  72 EXPORT_SYMBOL(ib_dealloc_pd);
  73
  74 /* Address handles */
  75
  76 struct ib_ah *ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
  77 {
  78         struct ib_ah *ah;
  79
  80         ah = pd->device->create_ah(pd, ah_attr);
  81
  82         if (!IS_ERR(ah)) {
  83                 ah->device  = pd->device;
  84                 ah->pd      = pd;
  85                 ah->uobject = NULL;
  86                 atomic_inc(&pd->usecnt);
  87         }
  88
  89         return ah;
  90 }
  91 EXPORT_SYMBOL(ib_create_ah);
  92
  93 struct ib_ah *ib_create_ah_from_wc(struct ib_pd *pd, struct ib_wc *wc,
  94                                    struct ib_grh *grh, u8 port_num)
  95 {
  96         struct ib_ah_attr ah_attr;
  97         u32 flow_class;
  98         u16 gid_index;
  99         int ret;
 100
 101         memset(&ah_attr, 0, sizeof ah_attr);
 102         ah_attr.dlid = wc->slid;
 103         ah_attr.sl = wc->sl;
 104         ah_attr.src_path_bits = wc->dlid_path_bits;
 105         ah_attr.port_num = port_num;
 106
 107         if (wc->wc_flags & IB_WC_GRH) {
 108                 ah_attr.ah_flags = IB_AH_GRH;
 109                 ah_attr.grh.dgid = grh->dgid;
 110
 111                 ret = ib_find_cached_gid(pd->device, &grh->sgid, &port_num,
 112                                          &gid_index);
 113                 if (ret)
 114                         return ERR_PTR(ret);
 115
 116                 ah_attr.grh.sgid_index = (u8) gid_index;
 117                 flow_class = be32_to_cpu(grh->version_tclass_flow);
 118                 ah_attr.grh.flow_label = flow_class & 0xFFFFF;
 119                 ah_attr.grh.traffic_class = (flow_class >> 20) & 0xFF;
 120                 ah_attr.grh.hop_limit = grh->hop_limit;
 121         }
 122
 123         return ib_create_ah(pd, &ah_attr);
 124 }
 125 EXPORT_SYMBOL(ib_create_ah_from_wc);
 126
 127 int ib_modify_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 128 {
 129         return ah->device->modify_ah ?
 130                 ah->device->modify_ah(ah, ah_attr) :
 131                 -ENOSYS;
 132 }
 133 EXPORT_SYMBOL(ib_modify_ah);
 134
 135 int ib_query_ah(struct ib_ah *ah, struct ib_ah_attr *ah_attr)
 136 {
 137         return ah->device->query_ah ?
 138                 ah->device->query_ah(ah, ah_attr) :
 139                 -ENOSYS;
 140 }
 141 EXPORT_SYMBOL(ib_query_ah);
 142
 143 int ib_destroy_ah(struct ib_ah *ah)
 144 {
 145         struct ib_pd *pd;
 146         int ret;
 147
 148         pd = ah->pd;
 149         ret = ah->device->destroy_ah(ah);
 150         if (!ret)
 151                 atomic_dec(&pd->usecnt);
 152
 153         return ret;
 154 }
 155 EXPORT_SYMBOL(ib_destroy_ah);
 156
 157 /* Shared receive queues */
 158
 159 struct ib_srq *ib_create_srq(struct ib_pd *pd,
 160                              struct ib_srq_init_attr *srq_init_attr)
 161 {
 162         struct ib_srq *srq;
 163
 164         if (!pd->device->create_srq)
 165                 return ERR_PTR(-ENOSYS);
 166
 167         srq = pd->device->create_srq(pd, srq_init_attr, NULL);
 168
 169         if (!IS_ERR(srq)) {
 170                 srq->device        = pd->device;
 171                 srq->pd            = pd;
 172                 srq->uobject       = NULL;
 173                 srq->event_handler = srq_init_attr->event_handler;
 174                 srq->srq_context   = srq_init_attr->srq_context;
 175                 atomic_inc(&pd->usecnt);
 176                 atomic_set(&srq->usecnt, 0);
 177         }
 178
 179         return srq;
 180 }
 181 EXPORT_SYMBOL(ib_create_srq);
 182
 183 int ib_modify_srq(struct ib_srq *srq,
 184                   struct ib_srq_attr *srq_attr,
 185                   enum ib_srq_attr_mask srq_attr_mask)
 186 {
 187         return srq->device->modify_srq(srq, srq_attr, srq_attr_mask);
 188 }
 189 EXPORT_SYMBOL(ib_modify_srq);
 190
 191 int ib_query_srq(struct ib_srq *srq,
 192                  struct ib_srq_attr *srq_attr)
 193 {
 194         return srq->device->query_srq ?
 195                 srq->device->query_srq(srq, srq_attr) : -ENOSYS;
 196 }
 197 EXPORT_SYMBOL(ib_query_srq);
 198
 199 int ib_destroy_srq(struct ib_srq *srq)
 200 {
 201         struct ib_pd *pd;
 202         int ret;
 203
 204         if (atomic_read(&srq->usecnt))
 205                 return -EBUSY;
 206
 207         pd = srq->pd;
 208
 209         ret = srq->device->destroy_srq(srq);
 210         if (!ret)
 211                 atomic_dec(&pd->usecnt);
 212
 213         return ret;
 214 }
 215 EXPORT_SYMBOL(ib_destroy_srq);
 216
 217 /* Queue pairs */
 218
 219 struct ib_qp *ib_create_qp(struct ib_pd *pd,
 220                            struct ib_qp_init_attr *qp_init_attr)
 221 {
 222         struct ib_qp *qp;
 223
 224         qp = pd->device->create_qp(pd, qp_init_attr, NULL);
 225
 226         if (!IS_ERR(qp)) {
 227                 qp->device        = pd->device;
 228                 qp->pd            = pd;
 229                 qp->send_cq       = qp_init_attr->send_cq;
 230                 qp->recv_cq       = qp_init_attr->recv_cq;
 231                 qp->srq           = qp_init_attr->srq;
 232                 qp->uobject       = NULL;
 233                 qp->event_handler = qp_init_attr->event_handler;
 234                 qp->qp_context    = qp_init_attr->qp_context;
 235                 qp->qp_type       = qp_init_attr->qp_type;
 236                 atomic_inc(&pd->usecnt);
 237                 atomic_inc(&qp_init_attr->send_cq->usecnt);
 238                 atomic_inc(&qp_init_attr->recv_cq->usecnt);
 239                 if (qp_init_attr->srq)
 240                         atomic_inc(&qp_init_attr->srq->usecnt);
 241         }
 242
 243         return qp;
 244 }
 245 EXPORT_SYMBOL(ib_create_qp);
 246
 247 int ib_modify_qp(struct ib_qp *qp,
 248                  struct ib_qp_attr *qp_attr,
 249                  int qp_attr_mask)
 250 {
 251         return qp->device->modify_qp(qp, qp_attr, qp_attr_mask);
 252 }
 253 EXPORT_SYMBOL(ib_modify_qp);
 254
 255 int ib_query_qp(struct ib_qp *qp,
 256                 struct ib_qp_attr *qp_attr,
 257                 int qp_attr_mask,
 258                 struct ib_qp_init_attr *qp_init_attr)
 259 {
 260         return qp->device->query_qp ?
 261                 qp->device->query_qp(qp, qp_attr, qp_attr_mask, qp_init_attr) :
 262                 -ENOSYS;
 263 }
 264 EXPORT_SYMBOL(ib_query_qp);
 265
 266 int ib_destroy_qp(struct ib_qp *qp)
 267 {
 268         struct ib_pd *pd;
 269         struct ib_cq *scq, *rcq;
 270         struct ib_srq *srq;
 271         int ret;
 272
 273         pd  = qp->pd;
 274         scq = qp->send_cq;
 275         rcq = qp->recv_cq;
 276         srq = qp->srq;
 277
 278         ret = qp->device->destroy_qp(qp);
 279         if (!ret) {
 280                 atomic_dec(&pd->usecnt);
 281                 atomic_dec(&scq->usecnt);
 282                 atomic_dec(&rcq->usecnt);
 283                 if (srq)
 284                         atomic_dec(&srq->usecnt);
 285         }
 286
 287         return ret;
 288 }
 289 EXPORT_SYMBOL(ib_destroy_qp);
 290
 291 /* Completion queues */
 292
 293 struct ib_cq *ib_create_cq(struct ib_device *device,
 294                            ib_comp_handler comp_handler,
 295                            void (*event_handler)(struct ib_event *, void *),
 296                            void *cq_context, int cqe)
 297 {
 298         struct ib_cq *cq;
 299
 300         cq = device->create_cq(device, cqe, NULL, NULL);
 301
 302         if (!IS_ERR(cq)) {
 303                 cq->device        = device;
 304                 cq->uobject       = NULL;
 305                 cq->comp_handler  = comp_handler;
 306                 cq->event_handler = event_handler;
 307                 cq->cq_context    = cq_context;
 308                 atomic_set(&cq->usecnt, 0);
 309         }
 310
 311         return cq;
 312 }
 313 EXPORT_SYMBOL(ib_create_cq);
 314
 315 int ib_destroy_cq(struct ib_cq *cq)
 316 {
 317         if (atomic_read(&cq->usecnt))
 318                 return -EBUSY;
 319
 320         return cq->device->destroy_cq(cq);
 321 }
 322 EXPORT_SYMBOL(ib_destroy_cq);
 323
 324 int ib_resize_cq(struct ib_cq *cq,
 325                  int           cqe)
 326 {
 327         int ret;
 328
 329         if (!cq->device->resize_cq)
 330                 return -ENOSYS;
 331
 332         ret = cq->device->resize_cq(cq, &cqe);
 333         if (!ret)
 334                 cq->cqe = cqe;
 335
 336         return ret;
 337 }
 338 EXPORT_SYMBOL(ib_resize_cq);
 339
 340 /* Memory regions */
 341
 342 struct ib_mr *ib_get_dma_mr(struct ib_pd *pd, int mr_access_flags)
 343 {
 344         struct ib_mr *mr;
 345
 346         mr = pd->device->get_dma_mr(pd, mr_access_flags);
 347
 348         if (!IS_ERR(mr)) {
 349                 mr->device  = pd->device;
 350                 mr->pd      = pd;
 351                 mr->uobject = NULL;
 352                 atomic_inc(&pd->usecnt);
 353                 atomic_set(&mr->usecnt, 0);
 354         }
 355
 356         return mr;
 357 }
 358 EXPORT_SYMBOL(ib_get_dma_mr);
 359
 360 struct ib_mr *ib_reg_phys_mr(struct ib_pd *pd,
 361                              struct ib_phys_buf *phys_buf_array,
 362                              int num_phys_buf,
 363                              int mr_access_flags,
 364                              u64 *iova_start)
 365 {
 366         struct ib_mr *mr;
 367
 368         mr = pd->device->reg_phys_mr(pd, phys_buf_array, num_phys_buf,
 369                                      mr_access_flags, iova_start);
 370
 371         if (!IS_ERR(mr)) {
 372                 mr->device  = pd->device;
 373                 mr->pd      = pd;
 374                 mr->uobject = NULL;
 375                 atomic_inc(&pd->usecnt);
 376                 atomic_set(&mr->usecnt, 0);
 377         }
 378
 379         return mr;
 380 }
 381 EXPORT_SYMBOL(ib_reg_phys_mr);
 382
 383 int ib_rereg_phys_mr(struct ib_mr *mr,
 384                      int mr_rereg_mask,
 385                      struct ib_pd *pd,
 386                      struct ib_phys_buf *phys_buf_array,
 387                      int num_phys_buf,
 388                      int mr_access_flags,
 389                      u64 *iova_start)
 390 {
 391         struct ib_pd *old_pd;
 392         int ret;
 393
 394         if (!mr->device->rereg_phys_mr)
 395                 return -ENOSYS;
 396
 397         if (atomic_read(&mr->usecnt))
 398                 return -EBUSY;
 399
 400         old_pd = mr->pd;
 401
 402         ret = mr->device->rereg_phys_mr(mr, mr_rereg_mask, pd,
 403                                         phys_buf_array, num_phys_buf,
 404                                         mr_access_flags, iova_start);
 405
 406         if (!ret && (mr_rereg_mask & IB_MR_REREG_PD)) {
 407                 atomic_dec(&old_pd->usecnt);
 408                 atomic_inc(&pd->usecnt);
 409         }
 410
 411         return ret;
 412 }
 413 EXPORT_SYMBOL(ib_rereg_phys_mr);
 414
 415 int ib_query_mr(struct ib_mr *mr, struct ib_mr_attr *mr_attr)
 416 {
 417         return mr->device->query_mr ?
 418                 mr->device->query_mr(mr, mr_attr) : -ENOSYS;
 419 }
 420 EXPORT_SYMBOL(ib_query_mr);
 421
 422 int ib_dereg_mr(struct ib_mr *mr)
 423 {
 424         struct ib_pd *pd;
 425         int ret;
 426
 427         if (atomic_read(&mr->usecnt))
 428                 return -EBUSY;
 429
 430         pd = mr->pd;
 431         ret = mr->device->dereg_mr(mr);
 432         if (!ret)
 433                 atomic_dec(&pd->usecnt);
 434
 435         return ret;
 436 }
 437 EXPORT_SYMBOL(ib_dereg_mr);
 438
 439 /* Memory windows */
 440
 441 struct ib_mw *ib_alloc_mw(struct ib_pd *pd)
 442 {
 443         struct ib_mw *mw;
 444
 445         if (!pd->device->alloc_mw)
 446                 return ERR_PTR(-ENOSYS);
 447
 448         mw = pd->device->alloc_mw(pd);
 449         if (!IS_ERR(mw)) {
 450                 mw->device  = pd->device;
 451                 mw->pd      = pd;
 452                 mw->uobject = NULL;
 453                 atomic_inc(&pd->usecnt);
 454         }
 455
 456         return mw;
 457 }
 458 EXPORT_SYMBOL(ib_alloc_mw);
 459
 460 int ib_dealloc_mw(struct ib_mw *mw)
 461 {
 462         struct ib_pd *pd;
 463         int ret;
 464
 465         pd = mw->pd;
 466         ret = mw->device->dealloc_mw(mw);
 467         if (!ret)
 468                 atomic_dec(&pd->usecnt);
 469
 470         return ret;
 471 }
 472 EXPORT_SYMBOL(ib_dealloc_mw);
 473
 474 /* "Fast" memory regions */
 475
 476 struct ib_fmr *ib_alloc_fmr(struct ib_pd *pd,
 477                             int mr_access_flags,
 478                             struct ib_fmr_attr *fmr_attr)
 479 {
 480         struct ib_fmr *fmr;
 481
 482         if (!pd->device->alloc_fmr)
 483                 return ERR_PTR(-ENOSYS);
 484
 485         fmr = pd->device->alloc_fmr(pd, mr_access_flags, fmr_attr);
 486         if (!IS_ERR(fmr)) {
 487                 fmr->device = pd->device;
 488                 fmr->pd     = pd;
 489                 atomic_inc(&pd->usecnt);
 490         }
 491
 492         return fmr;
 493 }
 494 EXPORT_SYMBOL(ib_alloc_fmr);
 495
 496 int ib_unmap_fmr(struct list_head *fmr_list)
 497 {
 498         struct ib_fmr *fmr;
 499
 500         if (list_empty(fmr_list))
 501                 return 0;
 502
 503         fmr = list_entry(fmr_list->next, struct ib_fmr, list);
 504         return fmr->device->unmap_fmr(fmr_list);
 505 }
 506 EXPORT_SYMBOL(ib_unmap_fmr);
 507
 508 int ib_dealloc_fmr(struct ib_fmr *fmr)
 509 {
 510         struct ib_pd *pd;
 511         int ret;
 512
 513         pd = fmr->pd;
 514         ret = fmr->device->dealloc_fmr(fmr);
 515         if (!ret)
 516                 atomic_dec(&pd->usecnt);
 517
 518         return ret;
 519 }
 520 EXPORT_SYMBOL(ib_dealloc_fmr);
 521
 522 /* Multicast groups */
 523
 524 int ib_attach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
 525 {
 526         return qp->device->attach_mcast ?
 527                 qp->device->attach_mcast(qp, gid, lid) :
 528                 -ENOSYS;
 529 }
 530 EXPORT_SYMBOL(ib_attach_mcast);
 531
 532 int ib_detach_mcast(struct ib_qp *qp, union ib_gid *gid, u16 lid)
 533 {
 534         return qp->device->detach_mcast ?
 535                 qp->device->detach_mcast(qp, gid, lid) :
 536                 -ENOSYS;
 537 }
 538 EXPORT_SYMBOL(ib_detach_mcast);